Luke 15:23 - Ellicott's Commentary On The Whole Bible

Bring hither the fatted calf. — It is interesting to remember the impression which this part of the parable made on one of the great teachers of the Church as early as the second century. Irenaeus (see Introduction) saw in it an illustration of what seemed to him the special characteristic of St. Luke’s Gospel, viz., the stress which it lays on the priestly aspect of our Lord’s work and ministry. We note, after our more modern method, (1) that in the framework of the story, the definite article points to “the calf” that had been fattened as for some special feast of joy. It answers accordingly to the “feast of fat things” of Isaiah 25:6 - i.e., to the joy of the full fruition of the presence of God; and there is, perhaps, in the command to “kill it” (the word used is the technical one for slaying a sacrificial victim) a half-suggestion that this was only possible through a sacrifice and death. The fatted calf thus comes to represent to us that of which the Eucharistic feast is at once a symbol, a witness, and a pledge.